How Many Zeros in a Googolplex?
A googolplex has 10100 zeros — a googol of zeros — making it one of the largest named numbers in mathematics. Written as 10googol or 10(10100), a googolplex is a 1 followed by a googol of zeros. The number is so vast that it cannot be written out in standard decimal notation: there are far fewer atoms in the entire observable universe than there are zeros in a googolplex. The name was coined by mathematician Edward Kasner in the 1930s, with the spelling suggested by his nine-year-old nephew Milton Sirotta. Related: How many zeros in a googolplexian.
A googolplex has
10¹⁰⁰
zeros
- Written Form
- 1 followed by a googol zeros
- Scientific
- 10^(10¹⁰⁰)
How Many Zeros Are in a Googolplex?
A googolplex has exactly 10100 zeros — a quantity called a googol. A googol itself is already incomprehensibly large: 1 followed by 100 zeros, or 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000. The zeros in a googolplex are not 100 zeros — they are a googol of zeros, which means you need 10100 individual zero digits to write out the number. See also: How many zeros in each number.
| Number | Zeros | Scientific notation |
|---|---|---|
| Googol | 100 | 10100 |
| Googolplex | 10100 (a googol) | 10(10100) |
To appreciate the difference: a googol has 100 zeros, while a googolplex has a googol of zeros. The step from googol to googolplex is not adding zeros — it is raising the zero count to a power that is itself a googol.
Does a Googolplex Have 1,000,000 Zeros?
No. A googolplex does not have one million zeros — it has 10100 zeros, which is incomparably larger than one million (106). Even one trillion zeros (1012) would be negligibly small compared to a googolplex. One million is 6 zeros in scientific notation; 10100 is a 1 followed by 100 zeros. The googolplex dwarfs any finite number that can be described with ordinary language.
Why Can't You Write Out a Googolplex?
Writing a googolplex in full decimal form is physically impossible, not merely impractical. The observable universe contains roughly 1080 atoms. Even if every atom were converted into ink to print a single zero, you would run out of matter at around 1080 zeros — still an unimaginably small fraction of the 10100 zeros a googolplex requires.
Time is equally constraining. If you wrote one zero per second from the beginning of the universe (~13.8 billion years = roughly 4.3 × 1017 seconds), you would have written fewer than 1018 zeros. At that rate, writing all 10100 zeros of a googolplex would take a time span roughly 1082 times longer than the current age of the universe.
This is why googolplex — despite being a precisely defined number — exists only as a mathematical concept. It can be expressed (10googol), compared, and reasoned about, but it cannot be fully written, displayed, or stored in any physical medium.